It's for google, we're not even meant to read them.
Say you own the website "massivepenispills.com", you want your site to be at the top of the results when people search for"penis enlargement" on google.

One thing that helps you get higher in the google rankings is having lots of other sites with links to yours.

Google thinks you must be important, as people from reputable sites like newsbiscuit are linking to you.